Kossel-Lewis Approach To Chemical Bonding
Chapter Name : Chemical Bonding And Molecular Structure |
Sub Topic Code : 102_11_04_02_04 |
Topic Name : Kossel-Lewis Approach To Chemical Bonding |
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Sub Topic Name : Lewis Representation Of Simple Molecules (the Lewis Structures) |
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Introduction
• The Lewis dot structures provide a picture of bonding in molecules and ions in terms of the shared pairs of electrons and the octet rule. • The Lewis structures help in understanding the formation and properties of a molecule to a large extent. • In general the least electronegative atom occupies the central position in the molecule/ion.
Pre-Requisites:
Chemical symbol, chemical bond, octet rule, electronegative, lone pair
Activity:
All matter, piece of wood, bucket, chalk, universe are all composed of molecules. These molecules have various bonds within them.
Real Life Question:
How does one know which atom is bonded to which atom?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
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| Electrostatic bond | • The bond formed, as a result of the electrostatic attraction between the positive and negative ions was termed as the electrovalent bond. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Pebbles and sticks | Make Lewis structures by using pebbles and sticks and observe how molecules are represented. |
Real life uses :
Bonding helps to bring stability, stable octet in case of chemical species.
Places to visit :
Kitchen, garage, park, garden
Practical examples around us
| Examples | Explainations |
|---|---|
| Wood, water, salt | All matter is made up of molecules. Molecules are made from atoms by chemical bonding. |
What you learn in Theory:
Chemical bonding in molecules is represented by using Lewis structures.
What you learn in Practice:
Lewis structures represent the number of electrons being shared between atoms forming a bond.